Telescopic tooth crown



Dec. 7 1926. 1,609,549

F. o. JAQUES. JR

TELESCOPIC TOOTH CROWN Filed April 28, 1926 :zmvrmraz? 1%. FfM

A'ITUHJVIY Patented Dec. 7, 1926.

'UNHTED STATES 1,609,549 PATENT orrics.

FERNANDO OSCAR JAQUES, 311, OF EEOVTBENGE, RI-IODE ISLANIDQ' 'rnnnscorroroorn onowiv.

Application filed April 28, 1928. Serial No. 105,181;

My invention has reference to an improvement in the art of dentistry andmore particularly to an improvement in tooth crowns in which one parttelescopes within the other part, of the tooth crown.

The form of tooth crown to which my improved tooth crown is particularlyadaptable is a tooth crown having a depression in the labial surfacewhich is filled with porcelain. These tooth crowns as heretoforeconstructed, are in the form of a single shell with the depressionformed in the shell in any well known way. 1

The object of my invention is to improve the construction of a metaltooth crown having a porcelain labial surface, whereby the tooth crownis formed of an inner and a corresponding outer shell, the inner shellforming the back of the depression for the porcelain and the outer shellhaving an opening the edges of which forms the edges of the depression,for the porcelain. The edges of the opening in the outer shell areslightly raised from the face of the inner shell, thereby forming acontinuous under cut recess, for more firmly securing or looking theporcelain in place.

My invention consists in the peculiar and novel construction of a toothcrown formed oftwo coinciding shells, one within the other, said toothcrown having details of construction, as will be more fully set. forthhereinafter and claimed.

Figure 1 is a vertical view of my improved telescopic tooth crown for aright upper incisor tooth and looking at the labial surface of thecrown.

Figure 2 is a vertical view of the same tooth crown, looking at themesial surface of the crown.

Figure 3 is a neck view looking down on the upper open end of the crown.

' Figure his a transverse sectional view through the crown, taken online 1, 4, of Figure 1. v e I V Figure 5 is a vertical view looking atthe labial surface of the outer shell. r a

Figure 6 is a vertical view looking at the labial surface of the innershell, and

Figure 7 is a detail sectional view taken on line 7 7, of Figure 1,through the labialpart t the inner shell and showing themdentures in thelabial part of the inner shell, another means tor holding the porcelainn Unite. 1

Figures 1, 2, 3, 4:, 5 and 6 are enlarged and Figure 7 is greatlyenlarged to'more clearly show my invention.

In the drawing 8 indicates a telescopic tooth crown consisting of aninner shell 9 and an outershell 10. As shown in the drawing the toothcrown has been formed into the shapeshown, after the shells have beentelescoped, one within the other. The crown shown is for a right uppercentralincisor tooth and the inner shell has first a driven fit withinthe outer shell. In the labial surface 11 of the shell is a depression12 formed as follows. An opening 13 is formed in the labial surface 11of the outer shell of any shape required, the edges 14 of this opening13 forms the edges of the depression 12 and the labial surface of theinner shell 9, forms the back 15 of the depression 12. The edges 1% ofthe opening 13 are slightly raised from the back 15 of the depression12, as shown in Figure 1, thereby forming an undercutspace 16 around theopening 13 for firmly securing the porcelain in place. The labialsurface of the inner shell, which forms the back 15 of the depression 12has a number of pointed indentures 18, 18, at opposite angles to eachother, as shown in Figure 7. The'porcelain, in a plastic condition, notshown, in forcing it into the depressicn 12, is forced under the edges1% of the opening 13 and into the undercut space 16 and into theindentures 18, 18, thereby firmly and positively securing theporcelainto the crown. The porcelain used for this purpose solidifiesunder atmospheric conditions. r

In the use of my improved telescopic tooth crown the porcelain is morepositively secured or locked to the labial surface of the crown and amore durable and perfect tooth crown is produced, than has heretoforebeen done.

Having thus'described my invention I claim as new 1*- lpA tooth crownhaving a depression in its labial surface, said tooth crown consistingof two shells, one within the other, the outer shell having an openingwhich with the labial surface of the inner shell, forms the depressionin the labial surface of the crown, for the purpose as described. 7

2. A tooth crown having'a depression in its labial surface, said toothcrown c0nsisting of an outer shell having an opening in its labial side,the edges of said opening forming the edges of the depression and aninner shell, the labial surface of Which forms the back of thedepression, for the purpose as described.

3. A tooth crown having a depression in its labial surface, said toothcrown consist ing of an outer shell having an opening in its labialside, the edges of said opening forming the edges of the depression andan inner shell the labial surface of which forms the back of thedepression, said edges of the opening in the outer shell being raisedfrom the labial surface of the inner shell, for the nnpose as described.

4. A tooth crown having a depression in its labial surface, said toothcrown consisting of an outer shell having an opening in its labial side,the edges of said opening torining the edges of the depression and aninner shell the labial surface of which forms the bacl: of thedepress-ion, said labial surface or side of the inner shell having indentures "formed at an an le to the labial surface of the shell said ecgee of the opening in the outer shell being raised from the labialsurface of the inner shell, thereby forming an undercut space around theedges of? the depression, lor the purpose as described. e

In testimony rhereoi' l have signed my name to this specification.

FERI ANDO warn? JAQUES, JR.

